If you’ve ever had the problem of being locked out of your own house – i.e. no key available to open it, you will kow how jolly annoying and time consuming this can be. So if this is ever likely to be a problem occuring in your household, then knowing what type of door locks you have will be imperative.
There are many, but to give an idea of the basics, let’s take a look at a standard five-lever mortice deadlock – even the name alone is enough to confuse a lot of people. It is commonly fitted to wooden doors and allows locking from both inside and outside with a key and is fitted within the fabric of the door itsef, not on the surface. Any five lever mortice deadlock that is not BS3621 specified will generally have a nightlatch fitted as additional security. It’s always recommended to ensure any nightlatch fitted as a 2nd lock is made to British Standards. If your 5 lever mortice deadlock doesn’t confirm to BS3621, it may well be missing the hard plates that would protect against drilling from a very determined burglar.